"Yannick " <yannick.monye@cox.com> wrote in message news:kflfgj$ibj$1@newscl01ah.mathworks.com...> Hey Steven,>> I was able to open the .CSV file in Excel although I did receive 2 > warnings:>> ==============================> The file you are trying to open, filename, is in a different format than > specified by the file extension. Verify that the file is not corrupted ans > is from a trusted source before opening the file. Dow you want to open the > file now?"> ==============================>> I clicked Yes and received another warning:>> ==============================> "Excel has detected that filename is a SYLK file, but cannot load it. > Either the file has errors or it is not a SYLK file format. Click OK to > try to open the file in a different format."> ==============================>> So then I saved my file as a new .XLSX file, tried loading that in MATLAB, > and I received the same error. By the way, the 100MB+ .XLSX file loads > fine in Microsoft Excel 2010.>> As mentioned before, the only lines of code I have uncommented are:>> ==============================> clc> clear> [num,~,raw] = xlsread(filename);> ==============================>> Any solutions?

If you haven't already, I recommend contacting Technical Support and providing them with one of the files that causes XLSREAD to error. Without being able to see the file it would be difficult to do a lot of diagnostic work.